David Cameron failed to declare two new meetings with News International chief Rebekah Brooks, including one just two days after his press aide Andy Coulson quit, it has emerged.

The Prime Minister met Mrs Brooks, who resigned as chief executive of News International months later over the phone hacklng affair, at a point-to-point race meeting in his Oxfordshire constituency. The pair also met at a local fair in Chipping Norton.

The meetings were not recorded in the official disclosure list published by Downing Street.

The pair reportedly texted each other on their mobile phones to ensure they were not spotted together when they met at the point to point on January 23 last year. Despite the attempt at secrecy, photographs of Mr Cameron were taken but have not been released at his request.

The timing was important because two days earlier Mr Coulson, a former editor of The News of the World, had resigned as Downing Street's communications director as pressure over the phone hacking scandal heightened.

The revelations come as both Mr Coulson and Mrs Brooks prepare to give evidence under oath to the Leveson inquiry on press ethics on Thursday and Friday.

Downing Street’s official list of meetings "with proprietors, editors and senior media executives”, only discloses four meetings with Mrs Brooks.

The January 23 meeting between the Camerons and Brookses - whose Oxfordshire houses are three miles apart - was not included, nor is a reported sixth meeting at a local fair in Chipping Norton, Oxfordshire.

Photographers at the point to point, organised by the Heythrop hunt, snapped David and Samantha Cameron, sitting with Rebekah Brooks and her husband and Telegraph columnist Charlie.

Another picture shows Mr Cameron talking with constituents, with his baby Florence strapped to his chest in a baby carrier.

Mr Cameron was also reportedly in regular contact by text message right up to the week when Mrs Brooks was forced to resign over the engulfing scandal last summer.

A new biography of Mr Cameron claimed one message told Mrs Brooks to “keep her head up and she would get through her difficulties”.

Another later message, sent via a third party, apologised for him not being in touch because “Ed Miliband had me on the run”.

The disclosures threaten to make a mockery of Mr Cameron’s attempts to be more transparent about his meetings with senior media figures.

He has been repeatedly reluctant to discuss his close links with Mrs Brooks. He only admitted he had ridden a retired police horse loaned to Mrs Brooks after three days of questioning by the Telegraph earlier this year.

Last night Labour called on Mr Cameron to release all contacts with Mrs Brooks since he became Prime Minister.

Gareth Thomas MP, the shadow Cabinet Office minister, said: “This shows that David Cameron has not been clear with the country and with Parliament about the full extent and terms of the meetings. He needs to put that right as a matter of urgency.

“The Prime Minister needs to disclose fully all his meetings and their terms, with Rebekah Brooks and other staff at News International as a matter of urgency.”

John Mann, Labour MP for Bassetlaw, added: “David Cameron’s ongoing relationship with RB is proving too close for comfort. It is perplexing to see how our Prime Minister found time to send journalists personal texts. He appears somewhat bewitched by her.”

Downing Street said the Jan 23 meeting was not included because it was not seen as official and it was not possible to detail everyone Mr Cameron met at events.

A No 10 spokesman said: “We have published records of the meetings and we believe they are comprehensive.”

He added that the Prime Minister would be happy to answer any detailed questions about the meetings when he appears on oath in front of the Leveson inquiry, which is now likely to be next month.

Last night, Mrs Brooks’ spokesman declined to comment. In evidence to a Commons committee, she failed to deny a report that the pair had met 26 times.

She told MPs: “The truth is that he is a neighbour and a friend, but I deem the relationship to be wholly appropriate and at no time have I ever had any conversation that you in the room would disapprove of.”